RESOLUTION
Problem:I have tried to fix Front Page Extension for windows account, but got Internal Error
Psoft.HSphere.Resources.IIS.FrontPage.FrontPageAdminUtilException: FrontPage Server Extensions admin tool failed with exit code: 327684;
Solution:
Most probably, H-Sphere cannot fix(update) Front Page Extension because it is turned Off in IIS.
You can check it, go to IIS management->Expand Web Sites->Right-click on needful domain ->Select All task-> and check if is installed Front page extension (if not you will see only Configure Server Extension). To solve this problem, you should turn Off /On Front Page via CP user menu in Web Service.